If you import the CSV as point in QGIS or in a spread sheet, you can easily
separate them using the forest ID. In Qgis, you can save them to a shape file
and then use the forest ID to split the shape file into different parts (vector
menu).
Then, you could use your method of triangulation.
I also remember a plugin that will chain point into polygons. Don't know
the name but search for something like point to line or point to
polygons.
Python will also permit you to do that directly but I would try first to find a
plugin that does it for you. I would help more but I am far from a PC.
Cheers
Nicolas Cadieux M.Sc.
On May 21, 2015 9:06 AM, "Nicole Stoffels [via OSGeo.org] "
<ml-node+s1560n5206903...@n6.nabble.com> wrote:
Dear QGIS-users,
I have a csv-file containing the corner coordinates of different forests
with different heights. The file is structured like this:
FID,forest_id,point_id,X,Y,height
1,forest1,point1,10.915763,54.137004,25
2,forest1,point2,10.917392,54.138734,25
3,forest1,point3,10.915822,54.140197,25
4,forest1,point4,10.913504,54.140824,25
5,forest1,point5,10.913541,54.138637,25
6,forest2,point1,10.897562,54.150324,20
7,forest2,point2,10.897907,54.149662,20
8,forest2,point3,10.900432,54.148912,20
9,forest2,point4,10.901194,54.149092,20
Now I want to make two polygons from the two different forests
containing the attribute height. If I had only one forest I would create
a voronoi diagram and a delaunay triangulation and clipper them. But it
would be too time consuming to do that for every forest, as I usually
have rather 10 forests or more. Is there a way to get this done if all
forests are in one csv-dataset only separated by there forest_id?
Thank you and sorry for the first mail, which was not yet finished.
Best wishes
Nicole
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